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John tries to rein in his compulsions, but is tested when he's tipped off about an impending massacre. Samantha, meanwhile, turns to Det. Holden for answers.
John wants to help Gretchen, but doesn't want to circumvent the law; and Samantha's doubts about John are increased by information provided to her by Kyle.
Detective Holden forces John to testify against the Latin gang, provoking their anger. Meanwhile, Samantha's past threatens her marriage.